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Hydrograph River at a Glance Download
Millstone River at Griggstown Stage (ft)Observed: 8.35 ft at 11:15AM May 19, 2022Observed: 8.4 ft at 11:30AM May 19, 2022Observed: 8.44 ft at 11:45AM May 19, 2022Observed: 8.46 ft at 12:00PM May 19, 2022Highest Observation: 8.48 ft at 12:15PM May 19, 2022Highest Observation: 8.48 ft at 12:30PM May 19, 2022Highest Observation: 8.48 ft at 12:45PM May 19, 2022Highest Observation: 8.48 ft at 1:00PM May 19, 2022Observed: 8.47 ft at 1:15PM May 19, 2022Observed: 8.45 ft at 1:30PM May 19, 2022Observed: 8.44 ft at 1:45PM May 19, 2022Observed: 8.41 ft at 2:00PM May 19, 2022Observed: 8.39 ft at 2:15PM May 19, 2022Observed: 8.37 ft at 2:30PM May 19, 2022Observed: 8.34 ft at 2:45PM May 19, 2022Observed: 8.32 ft at 3:00PM May 19, 2022Observed: 8.29 ft at 3:15PM May 19, 2022Observed: 8.26 ft at 3:30PM May 19, 2022Observed: 8.23 ft at 3:45PM May 19, 2022Observed: 8.21 ft at 4:00PM May 19, 2022Observed: 8.17 ft at 4:15PM May 19, 2022Observed: 8.14 ft at 4:30PM May 19, 2022Observed: 8.11 ft at 4:45PM May 19, 2022Observed: 8.09 ft at 5:00PM May 19, 2022Observed: 8.06 ft at 5:15PM May 19, 2022Observed: 8.03 ft at 5:30PM May 19, 2022Observed: 8.01 ft at 5:45PM May 19, 2022Observed: 7.98 ft at 6:00PM May 19, 2022Observed: 7.95 ft at 6:15PM May 19, 2022Observed: 7.93 ft at 6:30PM May 19, 2022Observed: 7.91 ft at 6:45PM May 19, 2022Observed: 7.89 ft at 7:00PM May 19, 2022Observed: 7.86 ft at 7:15PM May 19, 2022Observed: 7.84 ft at 7:30PM May 19, 2022Observed: 7.83 ft at 7:45PM May 19, 2022Observed: 7.81 ft at 8:00PM May 19, 2022Observed: 7.78 ft at 8:15PM May 19, 2022Observed: 7.77 ft at 8:30PM May 19, 2022Observed: 7.74 ft at 8:45PM May 19, 2022Observed: 7.73 ft at 9:00PM May 19, 2022Observed: 7.71 ft at 9:15PM May 19, 2022Observed: 7.7 ft at 9:30PM May 19, 2022Observed: 7.68 ft at 9:45PM May 19, 2022Observed: 7.67 ft at 10:00PM May 19, 2022Observed: 7.66 ft at 10:15PM May 19, 2022Observed: 7.64 ft at 10:30PM May 19, 2022Observed: 7.63 ft at 10:45PM May 19, 2022Observed: 7.62 ft at 11:00PM May 19, 2022Observed: 7.6 ft at 11:15PM May 19, 2022Observed: 7.58 ft at 11:30PM May 19, 2022Observed: 7.57 ft at 11:45PM May 19, 2022Observed: 7.55 ft at 12:00AM May 20, 2022Observed: 7.54 ft at 12:15AM May 20, 2022Observed: 7.52 ft at 12:30AM May 20, 2022Observed: 7.51 ft at 12:45AM May 20, 2022Observed: 7.5 ft at 1:00AM May 20, 2022Observed: 7.47 ft at 1:15AM May 20, 2022Observed: 7.47 ft at 1:30AM May 20, 2022Observed: 7.45 ft at 1:45AM May 20, 2022Observed: 7.43 ft at 2:00AM May 20, 2022Observed: 7.42 ft at 2:15AM May 20, 2022Observed: 7.4 ft at 2:30AM May 20, 2022Observed: 7.38 ft at 2:45AM May 20, 2022Observed: 7.36 ft at 3:00AM May 20, 2022Observed: 7.35 ft at 3:15AM May 20, 2022Observed: 7.34 ft at 3:30AM May 20, 2022Observed: 7.31 ft at 3:45AM May 20, 2022Observed: 7.3 ft at 4:00AM May 20, 2022Observed: 7.28 ft at 4:15AM May 20, 2022Observed: 7.26 ft at 4:30AM May 20, 2022Observed: 7.25 ft at 4:45AM May 20, 2022Observed: 7.23 ft at 5:00AM May 20, 2022Observed: 7.2 ft at 5:15AM May 20, 2022Observed: 7.18 ft at 5:30AM May 20, 2022Observed: 7.16 ft at 5:45AM May 20, 2022Observed: 7.14 ft at 6:00AM May 20, 2022Observed: 7.12 ft at 6:15AM May 20, 2022Observed: 7.09 ft at 6:30AM May 20, 2022Observed: 7.07 ft at 6:45AM May 20, 2022Observed: 7.05 ft at 7:00AM May 20, 2022Observed: 7.02 ft at 7:15AM May 20, 2022Observed: 7 ft at 7:30AM May 20, 2022Observed: 6.98 ft at 7:45AM May 20, 2022Observed: 6.95 ft at 8:00AM May 20, 2022Observed: 6.93 ft at 8:15AM May 20, 2022Observed: 6.91 ft at 8:30AM May 20, 2022Observed: 6.88 ft at 8:45AM May 20, 2022Observed: 6.86 ft at 9:00AM May 20, 2022Observed: 6.83 ft at 9:15AM May 20, 2022Observed: 6.8 ft at 9:30AM May 20, 2022Observed: 6.79 ft at 9:45AM May 20, 2022Observed: 6.76 ft at 10:00AM May 20, 2022Observed: 6.73 ft at 10:15AM May 20, 2022Observed: 6.71 ft at 10:30AM May 20, 2022Observed: 6.68 ft at 10:45AM May 20, 2022Observed: 6.65 ft at 11:00AM May 20, 2022Observed: 6.63 ft at 11:15AM May 20, 2022Observed: 6.6 ft at 11:30AM May 20, 2022Observed: 6.59 ft at 11:45AM May 20, 2022Observed: 6.56 ft at 12:00PM May 20, 2022Observed: 6.53 ft at 12:15PM May 20, 2022Observed: 6.51 ft at 12:30PM May 20, 2022Observed: 6.49 ft at 12:45PM May 20, 2022Observed: 6.46 ft at 1:00PM May 20, 2022Observed: 6.45 ft at 1:15PM May 20, 2022Observed: 6.41 ft at 1:30PM May 20, 2022Observed: 6.39 ft at 1:45PM May 20, 2022Observed: 6.37 ft at 2:00PM May 20, 2022Observed: 6.34 ft at 2:15PM May 20, 2022Observed: 6.32 ft at 2:30PM May 20, 2022Observed: 6.3 ft at 2:45PM May 20, 2022Observed: 6.27 ft at 3:00PM May 20, 2022Observed: 6.25 ft at 3:15PM May 20, 2022Observed: 6.22 ft at 3:30PM May 20, 2022Observed: 6.2 ft at 3:45PM May 20, 2022Observed: 6.18 ft at 4:00PM May 20, 2022Observed: 6.15 ft at 4:15PM May 20, 2022Observed: 6.12 ft at 4:30PM May 20, 2022Observed: 6.13 ft at 4:45PM May 20, 2022Observed: 6.16 ft at 5:00PM May 20, 2022Observed: 6.16 ft at 5:15PM May 20, 2022Observed: 6.19 ft at 5:30PM May 20, 2022Observed: 6.25 ft at 5:45PM May 20, 2022Observed: 6.31 ft at 6:00PM May 20, 2022Observed: 6.42 ft at 6:15PM May 20, 2022Observed: 6.53 ft at 6:30PM May 20, 2022Observed: 6.69 ft at 6:45PM May 20, 2022Observed: 6.84 ft at 7:00PM May 20, 2022Observed: 6.97 ft at 7:15PM May 20, 2022Observed: 7.07 ft at 7:30PM May 20, 2022Observed: 7.15 ft at 7:45PM May 20, 2022Observed: 7.24 ft at 8:00PM May 20, 2022Observed: 7.33 ft at 8:15PM May 20, 2022Observed: 7.43 ft at 8:30PM May 20, 2022Observed: 7.54 ft at 8:45PM May 20, 2022Observed: 7.63 ft at 9:00PM May 20, 2022Observed: 7.73 ft at 9:15PM May 20, 2022Observed: 7.82 ft at 9:30PM May 20, 2022Observed: 7.9 ft at 9:45PM May 20, 2022Observed: 8.15 ft at 12:00AM May 21, 2022Observed: 8.15 ft at 12:15AM May 21, 2022Observed: 8.14 ft at 12:30AM May 21, 2022Observed: 8.14 ft at 12:45AM May 21, 2022Observed: 8.14 ft at 1:00AM May 21, 2022Observed: 8.13 ft at 1:15AM May 21, 2022Observed: 8.13 ft at 1:30AM May 21, 2022Observed: 8.12 ft at 1:45AM May 21, 2022Observed: 8.12 ft at 2:00AM May 21, 2022Observed: 8.11 ft at 2:15AM May 21, 2022Observed: 8.1 ft at 2:30AM May 21, 2022Observed: 8.1 ft at 2:45AM May 21, 2022Observed: 8.09 ft at 3:00AM May 21, 2022Observed: 8.08 ft at 3:15AM May 21, 2022Observed: 8.07 ft at 3:30AM May 21, 2022Observed: 8.06 ft at 3:45AM May 21, 2022Observed: 8.06 ft at 4:00AM May 21, 2022Observed: 8.05 ft at 4:15AM May 21, 2022Observed: 8.05 ft at 4:30AM May 21, 2022Observed: 8.04 ft at 4:45AM May 21, 2022Observed: 8.04 ft at 5:00AM May 21, 2022Observed: 8.03 ft at 5:15AM May 21, 2022Observed: 8.03 ft at 5:30AM May 21, 2022Observed: 8.02 ft at 5:45AM May 21, 2022Observed: 8.01 ft at 6:00AM May 21, 2022Observed: 8.02 ft at 6:15AM May 21, 2022Observed: 8.02 ft at 6:30AM May 21, 2022Observed: 8.02 ft at 6:45AM May 21, 2022Observed: 8.02 ft at 7:00AM May 21, 2022Observed: 8.02 ft at 7:15AM May 21, 2022Observed: 8.02 ft at 7:30AM May 21, 2022Observed: 8.02 ft at 7:45AM May 21, 2022Observed: 8.02 ft at 8:00AM May 21, 2022Observed: 8.02 ft at 8:15AM May 21, 2022Observed: 8.02 ft at 8:30AM May 21, 2022Observed: 8.02 ft at 8:45AM May 21, 2022Observed: 8.02 ft at 9:00AM May 21, 2022Observed: 8.03 ft at 9:15AM May 21, 2022Observed: 8.02 ft at 9:30AM May 21, 2022Observed: 8.03 ft at 9:45AM May 21, 2022Observed: 8.03 ft at 10:00AM May 21, 2022Observed: 8.03 ft at 10:15AM May 21, 2022Observed: 8.03 ft at 10:30AM May 21, 2022Observed: 8.02 ft at 10:45AM May 21, 2022Observed: 8.02 ft at 11:00AM May 21, 2022Observed: 8.02 ft at 11:15AM May 21, 2022Observed: 8.02 ft at 11:30AM May 21, 2022Observed: 8.01 ft at 11:45AM May 21, 2022Observed: 8 ft at 12:00PM May 21, 2022Observed: 7.99 ft at 12:15PM May 21, 2022Observed: 7.99 ft at 12:30PM May 21, 2022Observed: 7.98 ft at 12:45PM May 21, 2022Observed: 7.98 ft at 1:00PM May 21, 2022Observed: 7.97 ft at 1:15PM May 21, 2022Observed: 7.97 ft at 1:30PM May 21, 2022Observed: 7.95 ft at 1:45PM May 21, 2022Observed: 7.94 ft at 2:00PM May 21, 2022Observed: 7.93 ft at 2:15PM May 21, 2022Observed: 7.92 ft at 2:30PM May 21, 2022Observed: 7.91 ft at 2:45PM May 21, 2022Observed: 7.9 ft at 3:00PM May 21, 2022Observed: 7.87 ft at 3:15PM May 21, 2022Observed: 7.87 ft at 3:30PM May 21, 2022Observed: 7.85 ft at 3:45PM May 21, 2022Observed: 7.83 ft at 4:00PM May 21, 2022Observed: 7.81 ft at 4:15PM May 21, 2022Observed: 7.8 ft at 4:30PM May 21, 2022Observed: 7.78 ft at 4:45PM May 21, 2022Observed: 7.76 ft at 5:00PM May 21, 2022Observed: 7.75 ft at 5:15PM May 21, 2022Observed: 7.73 ft at 5:30PM May 21, 2022Observed: 7.7 ft at 5:45PM May 21, 2022Observed: 7.69 ft at 6:00PM May 21, 2022Observed: 7.67 ft at 6:15PM May 21, 2022Observed: 7.65 ft at 6:30PM May 21, 2022Observed: 7.63 ft at 6:45PM May 21, 2022Observed: 7.61 ft at 7:00PM May 21, 2022Observed: 7.58 ft at 7:15PM May 21, 2022Observed: 7.57 ft at 7:30PM May 21, 2022Observed: 7.54 ft at 7:45PM May 21, 2022Observed: 7.52 ft at 8:00PM May 21, 2022Observed: 7.5 ft at 8:15PM May 21, 2022Observed: 7.48 ft at 8:30PM May 21, 2022Observed: 7.45 ft at 8:45PM May 21, 2022Observed: 7.42 ft at 9:00PM May 21, 2022Observed: 7.41 ft at 9:15PM May 21, 2022Observed: 7.37 ft at 9:30PM May 21, 2022Observed: 7.36 ft at 9:45PM May 21, 2022Observed: 7.33 ft at 10:00PM May 21, 2022Observed: 7.31 ft at 10:15PM May 21, 2022Observed: 7.29 ft at 10:30PM May 21, 2022Observed: 7.26 ft at 10:45PM May 21, 2022Observed: 7.24 ft at 11:00PM May 21, 2022Observed: 7.21 ft at 11:15PM May 21, 2022Observed: 7.19 ft at 11:30PM May 21, 2022Observed: 7.16 ft at 11:45PM May 21, 2022Observed: 7.14 ft at 12:00AM May 22, 2022Observed: 7.11 ft at 12:15AM May 22, 2022Observed: 7.09 ft at 12:30AM May 22, 2022Observed: 7.06 ft at 12:45AM May 22, 2022Observed: 7.04 ft at 1:00AM May 22, 2022Observed: 7.02 ft at 1:15AM May 22, 2022Observed: 6.99 ft at 1:30AM May 22, 2022Observed: 6.96 ft at 1:45AM May 22, 2022Observed: 6.94 ft at 2:00AM May 22, 2022Observed: 6.92 ft at 2:15AM May 22, 2022Observed: 6.9 ft at 2:30AM May 22, 2022Observed: 6.87 ft at 2:45AM May 22, 2022Observed: 6.84 ft at 3:00AM May 22, 2022Observed: 6.82 ft at 3:15AM May 22, 2022Observed: 6.79 ft at 3:30AM May 22, 2022Observed: 6.77 ft at 3:45AM May 22, 2022Observed: 6.75 ft at 4:00AM May 22, 2022Observed: 6.72 ft at 4:15AM May 22, 2022Observed: 6.7 ft at 4:30AM May 22, 2022Observed: 6.67 ft at 4:45AM May 22, 2022Observed: 6.65 ft at 5:00AM May 22, 2022Observed: 6.62 ft at 5:15AM May 22, 2022Observed: 6.6 ft at 5:30AM May 22, 2022Observed: 6.57 ft at 5:45AM May 22, 2022Observed: 6.55 ft at 6:00AM May 22, 2022Observed: 6.52 ft at 6:15AM May 22, 2022Observed: 6.5 ft at 6:30AM May 22, 2022Observed: 6.48 ft at 6:45AM May 22, 2022Observed: 6.46 ft at 7:00AM May 22, 2022Observed: 6.43 ft at 7:15AM May 22, 2022Observed: 6.42 ft at 7:30AM May 22, 2022Observed: 6.39 ft at 7:45AM May 22, 2022Observed: 6.36 ft at 8:00AM May 22, 2022Observed: 6.34 ft at 8:15AM May 22, 2022Observed: 6.32 ft at 8:30AM May 22, 2022Observed: 6.3 ft at 8:45AM May 22, 2022Observed: 6.28 ft at 9:00AM May 22, 2022Observed: 6.25 ft at 9:15AM May 22, 2022Observed: 6.23 ft at 9:30AM May 22, 2022Observed: 6.21 ft at 9:45AM May 22, 2022USGS--Water Resources of the United StatesGTNN4(plotting HGIRG) Graph Created (11:03AM May 22, 2022)ObservedLatest observed value: 6.21 ft at 9:45 AM EDT 22-May-2022. Flood Stage is 10 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts are not available for the Millstone River at Griggstown. Only observed stages are available for this point.
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Downstream Gauge Downstream Gauge - at Blackwells Mills
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 12
Flood Stage: 10
Action Stage: 9.5
Low Stage (in feet): 0

Historic Crests
(1) 24.21 ft on 08/28/2011
(2) 23.36 ft on 09/02/2021
(3) 23.20 ft on 09/16/1999
(4) 22.70 ft on 08/28/1971
(5) 22.16 ft on 04/16/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.91 ft on 04/08/2022
(2) 23.36 ft on 09/02/2021
(3) 17.24 ft on 08/23/2021
(4) 11.45 ft on 07/30/2021
(5) 11.56 ft on 03/02/2021
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
15 River Road flooding expands. The road closes between Grist Mill Drive and the Millstone Causway. Canal Road in Franklin Township floods.
12 River Road flooding expands near the Griggstown Causeway and begins south of Dead Tree Run Road.
10 River Road in Montgomery Township begins to flood near the Griggstown Causeway.
9.5 Griggstown Causeway is closed.
About This Location Collapse

Latitude: 40.440000° N, Longitude: 74.617500° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 10 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 26.52 36.52 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Additional Information Collapse
During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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